CN105695948A - Batch preprocessing method for mechanical seal rings with diamond coatings - Google Patents
Batch preprocessing method for mechanical seal rings with diamond coatings Download PDFInfo
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- CN105695948A CN105695948A CN201610048629.2A CN201610048629A CN105695948A CN 105695948 A CN105695948 A CN 105695948A CN 201610048629 A CN201610048629 A CN 201610048629A CN 105695948 A CN105695948 A CN 105695948A
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- 229910003460 diamond Inorganic materials 0.000 title claims abstract description 70
- 239000010432 diamond Substances 0.000 title claims abstract description 70
- 238000000034 method Methods 0.000 title claims abstract description 63
- 238000000576 coating method Methods 0.000 title claims abstract description 46
- 238000007781 pre-processing Methods 0.000 title abstract 7
- 238000007789 sealing Methods 0.000 claims abstract description 100
- 239000000758 substrate Substances 0.000 claims abstract description 21
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000006004 Quartz sand Substances 0.000 claims abstract description 16
- 229910052581 Si3N4 Inorganic materials 0.000 claims abstract description 16
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910010271 silicon carbide Inorganic materials 0.000 claims abstract description 15
- 239000002253 acid Substances 0.000 claims abstract description 9
- 239000000919 ceramic Substances 0.000 claims abstract description 9
- 230000003628 erosive effect Effects 0.000 claims abstract description 9
- 239000011159 matrix material Substances 0.000 claims description 30
- 239000000956 alloy Substances 0.000 claims description 27
- 229910045601 alloy Inorganic materials 0.000 claims description 27
- 238000005488 sandblasting Methods 0.000 claims description 17
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 14
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 10
- 230000005540 biological transmission Effects 0.000 claims description 9
- 239000010941 cobalt Substances 0.000 claims description 9
- 229910017052 cobalt Inorganic materials 0.000 claims description 9
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 238000004506 ultrasonic cleaning Methods 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 7
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 6
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 5
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 239000010949 copper Substances 0.000 claims description 4
- 238000002203 pretreatment Methods 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
- 238000007788 roughening Methods 0.000 claims description 3
- 229910008947 W—Co Inorganic materials 0.000 claims description 2
- 238000005530 etching Methods 0.000 claims description 2
- -1 potassium ferricyanide Chemical compound 0.000 claims description 2
- 239000001117 sulphuric acid Substances 0.000 claims description 2
- 235000011149 sulphuric acid Nutrition 0.000 claims description 2
- 238000000227 grinding Methods 0.000 abstract description 13
- 238000002360 preparation method Methods 0.000 abstract description 4
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 abstract description 3
- 230000007774 longterm Effects 0.000 abstract description 2
- 238000012545 processing Methods 0.000 abstract description 2
- 239000007921 spray Substances 0.000 abstract 1
- 230000000087 stabilizing effect Effects 0.000 abstract 1
- 238000000151 deposition Methods 0.000 description 21
- 239000010408 film Substances 0.000 description 18
- 239000011248 coating agent Substances 0.000 description 14
- 239000010409 thin film Substances 0.000 description 10
- 239000010410 layer Substances 0.000 description 9
- 230000008021 deposition Effects 0.000 description 8
- 239000000463 material Substances 0.000 description 8
- 239000002245 particle Substances 0.000 description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 4
- 239000012530 fluid Substances 0.000 description 4
- 238000004050 hot filament vapor deposition Methods 0.000 description 4
- 239000002113 nanodiamond Substances 0.000 description 4
- 238000004062 sedimentation Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 3
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 3
- 239000011230 binding agent Substances 0.000 description 3
- 239000004567 concrete Substances 0.000 description 3
- 239000008187 granular material Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000006911 nucleation Effects 0.000 description 3
- 238000010899 nucleation Methods 0.000 description 3
- 238000005381 potential energy Methods 0.000 description 3
- 230000003068 static effect Effects 0.000 description 3
- 244000137852 Petrea volubilis Species 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000005229 chemical vapour deposition Methods 0.000 description 2
- 238000005137 deposition process Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 238000000427 thin-film deposition Methods 0.000 description 2
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 239000008199 coating composition Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/02—Pretreatment of the material to be coated
- C23C16/0254—Physical treatment to alter the texture of the surface, e.g. scratching or polishing
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- Chemical & Material Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Vapour Deposition (AREA)
- Mechanical Sealing (AREA)
Abstract
The invention relates to a batch preprocessing method for mechanical seal rings with diamond coatings. Cemented carbide mechanical seal rings preprocessed through acid and base or unprocessed silicon carbide/silicon nitride ceramic mechanical seal rings are used as substrates, high-pressure airflow with quartz sand as a medium is adopted for conducting erosion coarsening on working surfaces of the seal rings, a seal ring batch preprocessing device is used for completing assembly line type preprocessing of the seal rings through automatic feeding of the eroded seal rings and automatic rotation of high-pressure spray nozzles, and uniformly coarsened surface appearances suitable for growth of diamond films are quickly prepared in batches. Compared with a manual grinding coarsening preprocessing method, the batch preprocessing method for the mechanical seal rings can remarkably improve processing efficiency, can guarantee uniform coarsening of different positions of the same sealing ring and the sealing rings in the same batch as well as long-term stability of the preprocessing process, and has important significance in stabilizing the preparation process of the mechanical seal rings with the diamond coatings and improving the quality of products.
Description
Technical field
The present invention relates to the mass preprocess method of a kind of diamond coatings mechanical seal ring, particularly relate to the mass preprocess method of a kind of diamond coatings mechanical seal ring undertaken by sealing ring mass pretreatment unit, belong to thin film technique field。
Background technology
Along with the continuous progress of science and technology, mechanical seal is widely used in various fluid machineries and equipment。According to investigations, in equipment in Oil Refining, the pump of more than 90% employs mechanical seal。Visible, mechanical seal occupies very important status in machine pump shaft seals。
In mechanically-sealing apparatus, dynamic and static sealing ring relies on spring tension to fit tightly, and the contact surface of two sealing rings is the key position of sealing device, directly determines the serviceability of whole pump。Dynamic and static sealing ring contact surface to when grinding, very easily suffers quick wear out failure in high speed, High Voltage and badness-media environment for a long time。The mechanical seal ring of employing conventional rigid alloy or carborundum/silicon nitride ceramic material manufacture abrasion resistance properties under many bad working environments is all difficult to reach the instructions for use of long-term stability, service life is shorter, has a strong impact on the properly functioning of pump equipment and increases equipment operation cost。Therefore, consider manufacturing cost and service life cost performance, the superhard coating material that hardness, wearability are higher should be adopted on traditional material basis。Chemical vapour deposition (CVD) (ChemicalVaporDeposition, CVD) diamond thin has hardness height (9000～10000HV), coefficient of friction is low, wearability is strong, surface chemistry inertia is high, and and machinery that between many engineering materials, weak adhesiveness etc. is excellent and tribological property。With Derjaguin and the Fedoseev of the former Soviet Union in 1975 propose to adopt on hard substrate the imagination of CVD depositing diamond, nineteen eighty-two Japan the scholar such as Matsumoto, Setaka adopt HFCVD method successful deposition diamond thin for the beginning, researcher all over the world has started the upsurge of deposition of diamond thin films principle and applied research thereof in the last thirty years。Due to hot-wire chemical gas-phase deposition (HotFilamentCVD, HFCVD) method is prepared diamond thin and is had the advantages such as equipment is simple and easy to control, deposition efficiency is high, depositional area is big, processing cost is low, base shape is unrestricted, now obtains most common application at industrial circle。
Through the literature search of prior art is found, United States Patent (USP) (US2009/0060408) " Diamondcoatedbearingorsealstructureandfluidmachinecompri singthesame " discloses the deposition preparation of diamond coatings sealing ring, but shorter mention seals the preprocess method before depositing diamond film。The patent " having the sealing ring of the running-in characteristic of raising " that application number is CN102097574A describes the running-in characteristic carrying out elevating mechanism sealing ring at the diamond coatings of mechanical sealing ring surface coating uniqueness and the composite coating of lubricant coating composition。The thickness proportion of diamond thin and lubricant coating is discussed in detail by patent；But, this patent polishes post processing for the pretreatment before diamond film coating layer, coating process, the concrete thickness of coating and subsequent thin film and is all not directed to。
Before carborundum/silicon nitride ceramics matrix surface depositing diamond film, it is necessary to matrix surface is ground in artificial alligatoring, to form the potential energy low spot being prone to diamond nucleation growth, strengthen the mechanical snap effect between diamond particles and blapharoplast simultaneously。
For hard alloy, cobalt element owing to existing as binding agent in Hardmetal materials has urges graphited effect, it can cause that in the deposition process of diamond thin the interface place of thin film and matrix forms a large amount of graphite and agraphitic carbon composition, significantly reduces the adhesive strength between thin film and matrix。Therefore the pretreatment of hard alloy has needed the alligatoring to matrix surface and top layer to go the process of cobalt two aspect。Mode general in the world now is to adopt soda acid two-step method that hard alloy is carried out pretreatment, but one layer of carbide particle weaker zone damaged can be retained through the pretreated cemented carbide substrate surfaces of soda acid two-step method, therefore still need to adopt the mode that artificial alligatoring is ground to remove weaker zone。
Hard alloy, carborundum/silicon nitride ceramics matrix pretreatment process in, artificial grind the work that alligatoring matrix working surface is a time-consuming effort, traditional method all adopts the fine grain sand paper manual grinding sealing ring working surface being moistened with diamond grinding fluid。But this method efficiency is low, and technology stability is difficult to ensure that, needs the efficiency and the technology stability that adopt more stable efficient method to carry out lift-off seal ring pretreatment badly。
Summary of the invention
It is an object of the invention to that hand lapping alligatoring sealing ring working surface efficiency in the pretreatment process for hard alloy or ceramic mechanical seal rings is low, the technological deficiency of the uniformity and technology stability difference, a kind of quickly diamond coatings mechanical seal ring mass preprocess method of exploitation。
It is an object of the invention to be achieved through the following technical solutions:
A kind of mass preprocess method of diamond coatings mechanical seal ring, it is characterized by, with the hard alloy mechanical sealing ring of acid-base pretreatment or untreated carborundum/silicon nitride ceramics mechanical seal ring for matrix, by sealing ring batch pretreatment unit, adopt quartz sand high pressure draught that above-mentioned sealing ring working surface is carried out erosion alligatoring, complete the pretreatment of sealing ring；
Described sealing ring batch pretreatment unit includes: bottom is positioned at below support with the operating platform of mobile rack, and transmission gear and a transmission motor are connected and engage with mobile rack；Cradle top is equipped with an electric rotating machine driving big swing pinion, big swing pinion and 8 little swing pinion engagements, being provided with the hole, location of axially different position on each little swing pinion, the high pressure draught conduit with shower nozzle is fixed in hole, location, and high pressure draught conduit is vertical with operating platform；Operating platform is provided with the cylindrical seal ring groove of 8 circumferential array, when sealing ring groove moves to sandblasting alligatoring district with mobile rack, and the center of circle of sealing ring groove and little swing pinion central coaxial；
The pre-treatment step of sealing ring is: by the hard alloy mechanical sealing ring of acid-base pretreatment or untreated carborundum/silicon nitride ceramics mechanical seal ring and be placed in sealing ring groove together with the close copper washer of sealing ring major diameter fit, enters sandblasting alligatoring district under transmission driven by motor；Opening electric rotating machine, drive large and small swing pinion, shower nozzle rotates in a circumferential direction one week around sealing ring center, makes the high pressure draught containing quartz sand complete the sandblasting roughening treatment to sealing ring working surface by shower nozzle；The sealing ring processed removes matrix surface impurity through the ultrasonic cleaning of pure water and acetone；
Wherein, the rotational velocity of big swing pinion is 0.32～0.4r/s, and corresponding little gear rotational velocity is 0.8～1r/s, containing quartz sand compressed air pressure 0.05～0.1MPa。
Described acid-base pretreatment is: first, is immersed in Murakami solution by the cemented carbide substrate of sealing ring and carries out ultrasonic cleaning in 30 minutes, makes tungsten carbide (WC) the granule fragmentation on hard alloy top layer, and causes matrix surface alligatoring；Subsequently, hard alloy substrate is immersed in Caro mixed acid solution the etching carrying out 1～4 minute cobalt element to remove its top layer；
Wherein, described hard alloy is W-Co kind hard alloy (YG6),
The composition of described Murakami solution is potassium hydroxide (KOH), the potassium ferricyanide (K3(Fe(CN)6)) and water (H2O), its quality proportioning is KOH:K3(Fe(CN)6): H2O=1:1:10,
The composition of described Caro mixed acid solution is concentrated sulphuric acid (H2SO4) and hydrogen peroxide (H2O2), its volume proportion is H2SO4: H2O2=1:10。
Preferably, the work circle ring center linear diameter of mechanical seal ring ranges for 35～80mm, and the radial width of work annulus ranges for 3～7mm, and quartz sand diameter is 100～120 orders。
Preferably, nozzle diameter 1mm, the distance of nozzle and finished surface is 3cm, and on sealing ring surface, effective sandblasting circular diameter of nozzle is 7mm。
Before hard alloy, carborundum/silicon nitride mechanical seal ring working surface depositing diamond film, artificial alligatoring is needed to grind matrix surface, to form the potential energy low spot being prone to diamond nucleation growth, strengthen the mechanical snap effect between diamond particles and blapharoplast simultaneously。
For hard alloy, cobalt element owing to existing as binding agent in Hardmetal materials has urges graphited effect, it can cause that in the deposition process of diamond thin the interface place of thin film and matrix forms a large amount of graphite and agraphitic carbon composition, significantly reduces the adhesive strength between thin film and matrix。Before grinding alligatoring hard alloy substrate, hard alloy substrate need to be carried out soda acid two-step method pretreatment, to remove cobalt element and the coarse surface of cemented carbide substrate surfaces。
Cemented carbide substrate surfaces after acid-base pretreatment retains one layer of carbide particle weaker zone damaged, and therefore still needs to carry out sandblasting alligatoring to remove top layer weaker zone。Carborundum/silicon nitride matrix, without pre-treatment, can be made directly sandblasting alligatoring pretreatment。Mechanical seal ring sandblasting roughening treatment carries out on mechanical seal ring mass pretreatment unit, sealing ring working surface is carried out sandblasting alligatoring by shower nozzle by the high pressure draught that the operation principle of this device is containing quartz sand, and process and self-feeding process while completing 8 sealing rings by the operating platform auto-translating of the automatic rotation of high-pressure nozzle and placement sealing ring, pretreatment efficiency relatively hand lapping treatment effeciency is greatly improved。
Corresponding, the method for hand lapping alligatoring mechanical seal ring is: adopt the soft sand paper hand lapping sealing ring working surface being moistened with diamond grinding fluid。Diamond grinding fluid adopts the diadust of 1～5um, and proportioning is 1g diadust: 10ml glycerol。
Finally, by hot-wire chemical gas-phase deposition method compact diamond thin between mass pretreated mechanical seal ring working surface deposition one layer and matrix。
Beneficial effect
Compared with the conventional method, present invention have the advantage that
The present invention adopts sealing ring batch pretreatment unit to complete the mass pretreatment of mechanical seal ring working surface, its advantage is the efficiency being obviously improved sealing ring pretreatment compared with hand lapping, it is ensured that the high-adhesion of the stability of pretreating process, surface coarsening degree uniformity and diamond thin and matrix。
Accompanying drawing explanation
By reading detailed description non-limiting example made with reference to the following drawings, other features of the present invention, purpose and advantage will become apparent from:
Fig. 1 mechanical seal structure schematic diagram
Fig. 2 mechanical seal ring deposition of diamond thin films schematic surface
Fig. 3 sealing ring mass pretreatment unit schematic diagram
Fig. 4 sealing ring mass pretreatment unit front view
Fig. 5 sealing ring mass pretreatment unit detail view
Fig. 6 hard alloy substrate pretreatment front surface pattern
Fig. 7 hard alloy substrate batch pretreatment rear surface pattern
Fig. 8 silicon nitride matrix pretreatment front surface pattern
Fig. 9 silicon nitride matrix batch pretreatment rear surface pattern
Parts representated by number in the figure are respectively as follows: 1-spring；2-rotary packing ring；The dynamic and static sealing ring contact surface of 3-；4-stationary seal ring；The working surface of 5-mechanical seal ring；6-transmits gear；The big swing pinion of 7-；The little swing pinion of 8-；9-operating platform；10-transmits motor；11-electric rotating machine；12-support；13-mechanical seal ring；14-copper washer；15-high pressure draught conduit；16-product rest area；17-sandblasting alligatoring district；18-takes out product zone；19-positions hole；20-high-pressure nozzle；21-mobile rack；22-sealing ring groove。
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is described in detail。Following example will assist in those skilled in the art and are further appreciated by the present invention, but do not limit the present invention in any form。It should be pointed out that, to those skilled in the art, without departing from the inventive concept of the premise, it is also possible to make some deformation and improvement。These broadly fall into protection scope of the present invention。
Mechanically-sealing apparatus, as it is shown in figure 1, wherein stationary seal ring 4, rotary packing ring 2 rely on spring 1 tension force to fit tightly, the contact surface 3 of two parts is the key position sealed, and directly determines the serviceability of whole pump。
The present invention adopts hot filament CVD to deposit one layer of diamond thin at the working surface 5 of mechanical seal ring; as shown in Figure 2; to reach to reduce working surface wear rate, lift-off seal ring working life and minimizing pump or the purpose of a whole set of chemical industry equipment machine stop times。
Sealing ring mass pretreatment unit, as shown in Fig. 3, Fig. 4, Fig. 5。Its workflow is: first together put in the cylindrical seal ring groove 22 of 8 circumferential array on operating platform 9 by mechanical seal ring 13 with the close copper washer 14 of its major diameter fit in product rest area 16；Subsequently, the rotation being fixed on the transmission motor 10 below support 12 drives transmission gear 6, converts rotational motion into rectilinear motion again through gear driven mobile rack 21, promotes operating platform that sealing ring is sent into sandblasting alligatoring district 17。By pinpointing bayonet unit, sealing ring is parked in the position coaxial with 8 little swing pinions 8 by fixing。Meanwhile, the circle that 8 groove centers of circle on operating platform are constituted is coaxial with the circle that 8 pinion rotation centers surround, and during to ensure swing pinion, the shower nozzle on little gear can rotate around the annulus that is roughened of sealing ring all the time。Subsequently, the electric rotating machine 11 being fixed on support 12 drives 8 little swing pinions to rotate around its center by big swing pinion 7 simultaneously, thus drives high pressure draught conduit 15 and high-pressure nozzle 20 to rotate in a circumferential direction around sealing ring center。8 shower nozzles carry out sandblasting to mechanical seal ring working surface with the quartz sand high pressure draught of mix homogeneously simultaneously, the whole circumference working surface of uniform alligatoring sealing ring。Shower nozzle is after sealing ring central rotation one week, and high-pressure nozzle stops sandblasting immediately, and the sealing ring that pretreatment is good is admitted to taking-up product zone 18。So going round and beginning again, this device just can complete the rapid batch sandblasting alligatoring pretreatment of mechanical seal ring。On little swing pinion, there is the hole, location 19 of multiple axially different position, to coordinate the various sizes of mechanical seal ring of pretreatment。
The effect of mass pretreatment mechanical seal ring is as follows:
Hard alloy substrate is before pretreatment, and as shown in Figure 6, surfacing, carbide particle is densely arranged, and in gap, distribution has Binder Phase cobalt。The roughness (Ra) that white light interferometer measures within the scope of 0.7mm × 0.7mm is 0.25um。After mass pretreatment, as it is shown in fig. 7, cemented carbide substrate surfaces is by uniform alligatoring, defining some holes between carbide particle granule, these holes are etched due to carbide particle and cobalt element causes after acid solution oxidation disappearance。After pretreatment, the roughness (Ra) of matrix surface is increased to 0.98um。
Silicon carbide substrate before pretreatment, as shown in Figure 8, any surface finish, granularity is inconspicuous。Adopting the roughness (Ra) that white light interferometer measures within the scope of 0.7mm × 0.7mm is 0.19um。Matrix surface is obtained, as it is shown in figure 9, owing to some granule is occurred uneven by erosion, now its surface roughness (Ra) rises to 0.78um after batch pretreatment。
Pattern before and after two kinds of matrix material mass pretreatment and the roughness contrast verification effectiveness of mass preprocess method alligatoring matrix surface。
The substrate surface topographical of above two alligatoring suitably forms the potential energy low spot of diamond nucleation, it is simple to form strong mechanical snap between diamond particles and matrix。
Embodiment 1
The diamond coatings mechanical seal ring of the present embodiment is applied in the delivery pump of PTA Equipment。Industrial chemicals containing a large amount of poisonous and harmfuls, inflammable and explosive and severe corrosive in this device, therefore requires very high to the resistance to chemical corrosion of the seal of device and mechanical seal。
The mechanical seal ring matrix of this application is YG6 hard alloy, and overall dimensions isWork surface is annular, internal diameter 34mm, external diameter 40mm。
Concretely comprising the following steps of conventional rigid alloy mechanical sealing ring working surface depositing diamond film: first sealing ring to be immersed supersound process 30min in Murakami solution, adopt Caro solution-treated hard alloy substrate 1 minute to remove the cobalt element of matrix skin after cleaning-drying again, adopt the method alligatoring matrix surface of hand lapping and automatic batch pretreatment subsequently。During mass pretreatment, high pressure draught pressure is 0.05Mpa, and quartz sand is of a size of 120 orders, high-pressure nozzle bore 1mm, shower nozzle be 3cm by the distance on erosion surface。Finally adopt acetone that sealing ring carries out ultrasonic cleaning, remove matrix surface impurity。In the process of depositing diamond film, the parallel sealing ring top that is placed in of heated filament, sealing ring annular distribution, sealing ring upper surface and heated filament spacing are 11mm。Divide two stages at cemented carbide substrate surfaces depositing diamond film。First the time depositing micron diamond thin film is 9 hours, and heater power is 13kw, and air pressure is 27Torr, and carbon source concentration is 1%, and substrate temperature is 800～900 DEG C, and bias current is 5.0A。Depositing nano-diamond film subsequently, heater power is 10kw, reaction gas pressure 22Torr, carbon source concentration 4%, and substrate temperature is 800～900 DEG C, and bias current is 3.0A, sedimentation time 3 hours。Before use, diamond coating for hard alloy mechanical seal ring need to through the flat polish of 5 hours。
Certain company subscribes 20 the type sealing rings altogether, hand lapping 4, process used time 30min；Mass is preconditioned 16, process used time 10min。The efficiency of mass pretreatment is 12 times of hand lapping。Meanwhile, after adopting mass preprocess method, pretreatment workshop workman is kept to 2 people from 4 people, and company's employment cost is substantially reduced。
Have employed multiple mechanical pump in the PTA Equipment of the said firm, the seal of mechanical seal directly concerns the safety in production of package unit。The diamond coatings mechanical seal ring of mass pretreatment uses 3, respectively 8 months life-span, 6 months and 7 months；Hand lapping diamond coatings mechanical seal ring uses 3, respectively 1 month life-span, 5 months and 9 months。As can be seen here, although mass preprocess method obtains diamond coatings mechanical seal ring MaLS not as good as hand lapping pretreatment, but its average length of working life is longer, and technology stability is higher。
Embodiment 2
Mechanical seal ring in the present embodiment directly applies to standard sealing ring performance test in 100 hours, and sealing ring matrix material is carborundum, and overall dimensions isWork surface is annular, internal diameter 40mm, external diameter 45mm。
Mass method for pretreating and hand grinding method is adopted to process 4 sealing rings respectively。Mass method for pretreating 5min consuming time, hand grinding method 30min consuming time。The work efficiency of mass method for pretreating is 6 times of hand grinding method。During mass pretreatment, high pressure draught pressure is 0.1Mpa, and quartz sand is of a size of 120 orders, high-pressure nozzle bore 1mm, shower nozzle be 3cm by the distance on erosion surface。
Subsequently, adopt pure water and acetone ultrasonic cleaning sealing ring, again through parallel heated filament arrangement mode 8 mechanical seal ring working surface depositing diamond films after the pre-treatment simultaneously。Finally, adopt flat polisher that working surface is polished。
The combination property of diamond coatings mechanical seal ring prepared by 100 hours sealing ring performance test Experimental comparison's hand grinding methods of employing standard and mass method for pretreating。The thickness of diamond thin is 30 microns。Medium is water, temperature 120～150 DEG C, and pressure is 0.9Mpa, rotating speed 6000 revs/min。After 100 hours modular mechanical seal test experiments, diamond coatings sealing ring prepared by 4 mass method for pretreating is showed no noticeable wear, and thin film is complete；And diamond coatings mechanical seal ring prepared by hand grinding method occurs in that part falls film after 50 hours test, film is fallen in 75 hours rear sections of a test, and all the other two 100 hours test rear films are complete, without noticeable wear。Illustrate that mass method for pretreating can reduce the diversity of different sealing ring performance compared with hand grinding method, it is ensured that the stability of product quality。
Embodiment 3
The diamond coatings mechanical seal ring of the present embodiment is applied on high-pressure pump, and pumped (conveying) medium is thickness cement liquid slurry, and sealing ring basic material is silicon nitride, and overall dimensions isWork surface is annular, internal diameter 30mm, external diameter 35mm。The concrete preparation method of this sealing ring is: grind alligatoring sealing ring working surface initially with mass preprocess method。During mass pretreatment, high pressure draught pressure is 0.1Mpa, and quartz sand is of a size of 120 orders, high-pressure nozzle bore 1mm, shower nozzle be 3cm by the distance on erosion surface。Adopt pure water and acetone that workpiece is carried out subsequently。Utilizing parallel heated filament arrangement mode simultaneously at 12 sealing ring surface depositing diamond films, heated filament is 10mm in the distance of deposition surface。The heated filament general power in micron diamond thin film deposition stage is 12kw, and air pressure is 26Torr sedimentation time is 9 hours；The heater power of nano-diamond film depositional phase is 10kw, and air pressure is 20Torr, sedimentation time 2.5 hours。Finally, adopting the smooth diamond coatings sealing ring working surface of flat polisher, polishing time is 6 hours。
Certain company is disposable buys this diamond-like coating mechanical seal ring 4 (standby containing 1), and 3 mechanical seal ring being currently in use normal operation 14 months continuously do not occur leakage phenomenon so far。And the average life of original non-coating silicon nitride mechanical seal ring is only 3 months。
Embodiment 4
The diamond coatings mechanical seal ring of the present embodiment is applied in higfh-tension ceramics powder transmission equipment。Seal ring material is carborundum, and overall dimensions isWork surface is annular, internal diameter 50mm, external diameter 55mm。
The concrete preparation flow of this diamond coatings carborundum mechanical seal ring is: initially with mass preprocess method pretreatment sealing ring working surface。During mass pretreatment, high pressure draught pressure is 0.1Mpa, and quartz sand is of a size of 120 orders, high-pressure nozzle bore 1mm, shower nozzle be 3cm by the distance on erosion surface。Finally adopt pure water and acetone ultrasonic cleaning sealing ring。Subsequently, utilizing 10 heated filament parallel arrangement modes simultaneously at 17 carborundum mechanical sealing ring surface depositing diamond films, wherein the micron diamond thin film deposition time is 8.5 hours, and nano-diamond film sedimentation time is 2.5 hours。Finally, adopting the smooth diamond film surface of flat polisher, the flat polish time is 5 hours。
Certain company have purchased 2 diamond coatings mechanical seal rings to substitute original non-coating mechanical seal ring。Adopt diamond coatings mechanical seal ring prepared by the method in use can significantly reduce the abrasion of sealing ring working surface。Non-coated silicon carbide mechanical seal ring uses working surface serious wear after 3 months, severe leakage phenomenon occurs；And diamond coatings sealing ring does not occur after using 1 year revealing yet, its working life is more than 4 times of non-coating sealing ring。Meanwhile, in diamond coatings mechanical seal ring use procedure, skin-friction coefficient is low, energy consumption is little in contact, and temperature rise is substantially less than non-coating mechanical seal ring。
Embodiment 5
The diamond coatings mechanical seal ring of the present embodiment is applied on olefines chemical medium pump。Sealing ring material is silicon nitride, and overall dimensions isWork surface is annular, internal diameter 40mm, external diameter 44mm。
The specific make step of this diamond-like coating mechanical seal ring is: initially with mass preprocess method pretreatment sealing ring working surface。During mass pretreatment, high pressure draught pressure is 0.1Mpa, and quartz sand is of a size of 120 orders, high-pressure nozzle bore 1mm, shower nozzle be 3cm by the distance on erosion surface。Last again with pure water and acetone ultrasonic cleaning sealing ring。Subsequently, utilize 11 heated filament parallel arrangement modes to deposit micron and nano-diamond film at 18 silicon nitride ceramics mechanical sealing ring surfaces simultaneously。Finally, adopting the smooth diamond film surface of flat polisher, the flat polish time is 5 hours。
Before adopting mass preprocess method, the silicon nitride mechanical seal ring of one external diameter 44mm of workman's hand lapping needs 8 minutes consuming time；And it is on average consuming time less than 1 minute to adopt mass preprocess method to process a sealing ring, pretreatment efficiency is greatly improved。Meanwhile, after adopting mass preprocess method, pretreatment workshop workman is kept to 2 people from 4 people, greatly reduces the employment cost of company。
When adopting diamond coatings mechanical seal ring prepared by this method to use on olefines chemical medium pump more than 6 times that working life is non-coating ceramic-seal ring。Meanwhile, in use procedure, sealing ring amount of leakage is minimum, and temperature rise more non-coating mechanical seal ring is low about 15 DEG C。
Claims (4)
1. the mass preprocess method of a diamond coatings mechanical seal ring, it is characterized by, with sealing ring for matrix, by sealing ring batch pretreatment unit, adopt quartz sand high pressure draught that above-mentioned sealing ring working surface is carried out erosion alligatoring, complete the pretreatment of sealing ring；
Described sealing ring includes the hard alloy mechanical sealing ring through acid-base pretreatment or untreated carborundum/silicon nitride ceramics mechanical seal ring,
Described sealing ring batch pretreatment unit includes: bottom is positioned at below support with the operating platform of mobile rack, and transmission gear and a transmission motor are connected and engage with mobile rack；Cradle top is equipped with an electric rotating machine driving big swing pinion, big swing pinion and 8 little swing pinion engagements, being provided with the hole, location of axially different position on each little swing pinion, the high pressure draught conduit with shower nozzle is fixed in hole, location, and high pressure draught conduit is vertical with operating platform；Operating platform is provided with the cylindrical seal ring groove of 8 circumferential array, when sealing ring groove moves to sandblasting alligatoring district with mobile rack, and the center of circle of sealing ring groove and little swing pinion central coaxial；
The pre-treatment step of sealing ring is: by described sealing ring and be placed on together with the close copper washer of its major diameter fit in described sealing ring groove, starts sealing ring batch pretreatment unit, enters sandblasting alligatoring district at transmission driven by motor lower sealing ring；Opening electric rotating machine, drive large and small swing pinion, shower nozzle rotates in a circumferential direction one week around sealing ring center, makes the high pressure draught containing quartz sand complete the sandblasting roughening treatment to sealing ring working surface by shower nozzle；The sealing ring processed removes matrix surface impurity through the ultrasonic cleaning of pure water and acetone；
Wherein, the rotational velocity of big swing pinion is 0.32～0.4r/s, and corresponding little gear rotational velocity is 0.8～1r/s, containing quartz sand compressed air pressure 0.05～0.1MPa。
2. the mass preprocess method of diamond coatings mechanical seal ring as claimed in claim 1, is characterized by, described acid-base pretreatment is: first, is immersed in Murakami solution by the cemented carbide substrate of sealing ring and carries out ultrasonic cleaning in 30 minutes；Subsequently, hard alloy substrate is immersed in Caro mixed acid solution the etching carrying out 1～4 minute cobalt element to remove its top layer；
Wherein, described hard alloy is W-Co kind hard alloy,
The composition of described Murakami solution is potassium hydroxide, the potassium ferricyanide and water, and its quality proportioning is KOH:K3(Fe(CN)6): H2O=1:1:10,
The composition of described Caro mixed acid solution is concentrated sulphuric acid and hydrogen peroxide, and its volume proportion is H2SO4: H2O2=1:10。
3. the mass preprocess method of diamond coatings mechanical seal ring as claimed in claim 1, it is characterized by, the work circle ring center linear diameter of described mechanical seal ring ranges for 35～80mm, and the radial width of work annulus ranges for 3～7mm, and quartz sand diameter is 100～120 orders。
4. the mass preprocess method of diamond coatings mechanical seal ring as claimed in claim 1, is characterized by, the nozzle diameter of described shower nozzle is 1mm, and the distance of nozzle and finished surface is 3cm, and on sealing ring surface, effective sandblasting circular diameter of nozzle is 7mm。
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| CN106282961A (en) * | 2016-08-24 | 2017-01-04 | 张家港合升进出口有限公司 | A kind of preparation method of cutter |
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| CN202225082U (en) * | 2011-08-09 | 2012-05-23 | 华闽南配集团股份有限公司 | Bar type sand blasting device for inner circle and excircle of piston ring |
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